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The wires run in a rubber hose in front of the fan. If the noise from the engine is too loud, try popping the hood to prevent the sound from being muffled. Normally it's caused by faulty clutch fan, Possible Cause: Clutch fan wire got cut/pulled by foreign factors. How Does a Viscous Fan Clutch Work? - YouTube I just checked, and yes the speed increase and decrease with rpm. This fluid's viscosity is measured in CST or centistokes and degrades over time. 0000066928 00000 n Identify Your Viscous Fan Clutch. If the clutch is constantly engaged, the vehicle will suffer from poor gas mileage and loss of horsepower. This animation of Horton's latest variable-speed fan drive, the LCX, shows viscous cooling technology in action. The fluid wears, rendering it incapable of grabbing the drive and driven plates and offer the gripping resistance needed to hold them together. The newest viscous drives also feature Cold-Start Disengagement, which can help trucks and agricultural tractors warm up faster during cold conditions. If fan speed is not detected a DTC will be set. A little heat is a good thing, improving fuel vaporization, performance, and fuel economy it also warms up the cabin in the winter. It was a junkyard unit off an 03 Envoy. A viscous fan clutch contains a thick fluid that can leak from the unit. Has the waterpump bearing seized around the fan shaft? Check All Cooling System Components Radiator, water pump, thermostat, temperature gauge, fault codes, etc. With more than eight years of experience, he specializes in providing maintenance and repair services for both individuals and companies. Yes, the one in this video is bad. Original fan and water pump. Suggestion: See if there's any foreign object stuck on clutch fan, if any foreign objects absent, then it is likely the clutch fan. The issue actually turned out to be a minor blown head gasket, with coolant slowly being shifted into the overflow bottle at high RPM and not being sucked back in, but the engine was able to get warmer because the viscous fan clutch wasn't working properly. Even if I pull the relay or unplug the fan it still runs fast. 450 A cooling fan clutch is expected to fail over time. Engine fan check - See if any damages on fan, 2. Before you go looking for your fan clutch, make sure your vehicle is in park, with the engine off and the handbrake firmly engaged. Our community has been around for many years and pride ourselves on offering unbiased, critical discussion among people of all different backgrounds. An overheating engine could literally weld itself into scrap metal. In addition to regulating engine temperatures with razor-sharp precision, viscous-operated fan drives can produce lower emissions, decrease noise pollution, provide fuel savings and ultimately increase performance. endstream endobj 15 0 obj <>>> endobj 16 0 obj <>/Font<>/ProcSet[/PDF/Text]/Properties<>>>/Rotate 0/TrimBox[0.0 0.0 612.0 792.0]/Type/Page>> endobj 17 0 obj <>stream My fan seems to run fast all the time but not loud like the jet engine i've read about. 0000066631 00000 n This is considered normal and may last more than 3 minutes in cooler climates or at lower driving speeds resulting in fan roar. 0000001551 00000 n These issues will draw the PCM's attention, and it will turn on the check engine light to warn you about them. 0000057354 00000 n trailer I am going to do a re test of mine, I think it is bad and I want to be sure. %%EOF By clicking I Accept on this banner you consent to the use of cookies unless you disable them. Hope you don't mind me referencing your video? 0000001016 00000 n 42 0 obj <> endobj When the engine starts to get too hot, the fan clutch takes the air flowing through the radiator, cools it down, and feeds it into the engine to cool it. 0000060915 00000 n Any input would be appreciated. Please note, comments must be approved before they are published, Solenoid coil / Actuator unable to rotate, When the engine is in low temperature or in capacity, the clutch is separated, fan speed rotates at low speed, When the engine is at high capacity and the water temperature rises, the clutch coupled and rotate together, the fan rotates at high speed, When water temperate reach designated low temperature, the clutch reverts back to separated state, The ECU will detect temperature via water temp sensor and operate accordingly. For more information about how to test a fan clutch, such as other signs to look for which indicate damage, read on. When the engine is off, there are a few things you can do to check the fan clutch: The internal combustion engine generates a lot of heat, which the engine cooling system is tasked with moderating. We use cookies to make wikiHow great. We had a few overheating issues at Bremer Bay Why is it overlooked? 0000053141 00000 n Get Started > Always in stock 0000037348 00000 n If it feels rough or does not turn then replace the drive. Always check for manufacturer's specifications for any special procedures. Viscous drives with CSD hold oil in the reservoir while the engine is off, so the fan disengages up to 80 percent faster than standard viscous drives. 2004-12-07T12:21:43-05:00 There are 7 references cited in this article, which can be found at the bottom of the page. But in the late 1950s, viscous fan clutches began to appear. Will go feel it again. Engine overheating at low speed or when stopped is the most-common fan clutch failure symptom. OK. All proceeds go to supporting the site. Unit 6 Scandinavia CourtChain Bar RoadCleckheatonBD19 3QW UK. If necessary, use the hood strut to hold the hood up so you can work unobstructed. The fan won't roar. Viscous fan drives | Variable speed fan clutch Now somethimes it only gets to halfway to 210, even in the summer. 6.7 cooling fan problem | Ford Powerstroke Diesel Forum Vehicle overheating One of the first symptoms that is commonly associated with a bad or failing fan clutch is an overheating engine. I dont want to go near the fan and try and stop it. Install the Horton EC450 TM Fan Clutch on the engine. If you still need assistance, contact our customer service team at (800) 810-9110. A viscous fan clutch enables the fan to more or less freewheel . adobe:docid:photoshop:f99bcbb8-4863-11d9-b0f7-b8eb50f766bb 0000000016 00000 n hbbd``b`:$@. The "drive disc" spins freely in the housing except for the silicon fluid. When I say it disengages, I mean it coasts to a stop! Electric cooling fan clutch. | The Truck Stop Some viscous properties of the fan hub may vary the res My issue was the fan would only engage intermittently using the Tech 2 and commanding full engagement. 4294967295 If you suspect the problem is a locked-in fan coupling, but dont know what fan clutch symptoms to look for, then youre in the right place. Identify Your Viscous Fan Clutch - Kit Masters If the fan clutch requires repair, take the vehicle to a qualified mechanic. Check it by releasing it from its seat and measuring the distance between the spring and its retainer. 0000030485 00000 n It does not function like an on/off drive. 0000001342 00000 n Alternatively, an optical tachometer can be used to measure fan speed. [JieZ`$@v*v}F)RNf-=}#>c,kc^pv5!1iiFLTL" #XjtvFHb4uubu0.-lD_r,`e)W/H]S$G+h'uqq6`G#ogkGFr'E{G=J'{GGPvR(n I have a 2003 EXT 4WD Trailblazer 235,000 miles. When I say it disengages, I mean it coasts to a stop! I'm open to ideas. NOTE: This fix will NOT help if your fan clutch is mechanically worn, or if the thermal va. As fan clutch specialists, weve seen plenty of faulty viscous drives in our time. From the exterior, a locked-in fan clutch will be hard to diagnose with just a visual check. The engine cooling fan, made of plastic or metal, isnt hard-connected to the fan pulley or water pump, but instead is soft-connected via the fan clutch. Not everyone has a scanner that can command the fan clutch. If your fan clutch has gone bad, replace it as soon as possible to prevent engine damage. Here's a list of the most common fan clutch noises and what each one could mean: 1. If the fan still hasnt kicked in by the time temperature reaches about 200F (93C), you can be sure that theres a problem somewhere. By signing up you are agreeing to receive emails according to our privacy policy. The pwm feed is positive so if that breaks it defaults to unlocked. Most fan clutches on newer vehicles are designed with a metal spring coil that reacts to changes in temperature and engages or disengages the fan accordingly. In our 97-98 AmTran REs, the 444s run 210* all the time, sometimes a little less in the winter, in the summer, the fans are almost constant on, and if it's hot enough (85-90* outside) they'll hit 230* under load. Hmmmmm.. that truck looks awfully familiar. Also verify no indication of viscous fluid leakage. Skip to content Visit Us Diesel Components Inc. 670 E. Travelers Trail #105 Burnsville, MN 55337 Send an Email sales@dieselcomponentsinc.com Call us (800) 252-6625| (952) 890-2885 Buy Parts SERVICES Troubleshooting Common Condenser Fan Problems, Signs and Symptoms of Spark Plug Problems, Reasons Why Your Car's Idle Speed Might Be Too High, Engine Ignition and Cam Timing for the Novice, Troubleshooting Engine Driveability Problems: Surging or Misfiring. You are also talking to people that have been doing this for a while on this platform. Make sure your new fan clutch is the same type as the original. As you could imagine, trying to stop a locked fan with a rag would not be a pleasant experience. %PDF-1.4 % Ed Beery is an Automotive Specialist and the Owner of InTechgrity Automotive Excellence based in Denver, Colorado. LEARN MORE >>. Electrical faults don't have to be wiring, they can be control module input/output related including: Mooseman, post was a long time ago and not sure this is even active! I fixed the pictures in my thread. These elements are natural in the process of Writing in a foreign language. A bad fan clutch can cause engine problems like excessively high temperatures and poor performance. Wire check - See if the wire to ECU is normal, 4. Try it again but pull the fan relay. Never attempt to inspect or handle any of the mechanical components in the engine compartment while the engine is running. Thank you. The fan needs to operate within the limits at each test point.The fan should engage and remain engaged during the entire engagement request. Wire check - See if the wire to ECU is normal 4. Fan Clutch Failure Modes and Troubleshooting | GMB Blog For more information about how to test a fan clutch, such as other signs to look for which indicate damage, read on. 0000060378 00000 n 42 36 Registered in England. You should feel some tugging from the fan trying to get it going again. LEARN MORE >>, Cold-Start Disengagement helps engines warm up faster in the cold. Found loose internal connections at the harness connector on the clutch and tightened them up a bit. Give the water pump hose a quick jostle as well to see if the problem might lie there. (The previous clutch had loose bearings.) o! Listen out for a gentle roar from the fan clutch when youre driving at least 50 miles per hour, as this can indicate that its binding or locking up. Fan clutch engaged on cold startup on 4.6 V8? | Ford Explorer - Ford This is because the clutch will seem to be in perfect working order, as the fault is on the inside. As a result, you may think that your fan clutch has seized. A locked-in, or seized, fan clutch can cause radiator fans to fully engage at all speeds. The fan clutch should be disengaged with no voltage applied. They make a loud whirling sound at highway speeds and when revving the engine.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'freeasestudyguides_com-medrectangle-4','ezslot_3',116,'0','0'])};__ez_fad_position('div-gpt-ad-freeasestudyguides_com-medrectangle-4-0'); Because the crankshaft drives this fan, check the accessory drive belt for wear and glazing. No CEL. As the engine speed increases, the blades of a flex fan change their angle. Viscous fan hub; is yours working as it should? - 4WDing Australia Shows the signals to and from the the fan and how the fan operates when commanded by the PCM and the scanner. 0000002179 00000 n Okay, so in your other post to me about testing it you say that the one in this video is bad. Viscous Fan Clutch. Then test the fan clutch by giving it a good push. 0000049576 00000 n It will also set a code if the fan clutch is not running at the set RPM - too slow or too fast. Overheating constantly, in trafc and on long pulls Check the coolant level. >Vyzy{=sUt\z^{W{7^sU:GWEzz5x=^s^[=^s+^o=^s{O=:y{^o==r. Company No. 1 0 obj<>/Metadata 259 0 R>> endobj 2 0 obj<> endobj 3 0 obj<> endobj 5 0 obj null endobj 8 0 obj<>/Font<>/XObject<>/ProcSet[/PDF/Text/ImageC]/ExtGState<>/Properties<>/MC1<>>>>>>> endobj 11 0 obj<> endobj 18 0 obj<> endobj 44 0 obj<>stream As engine temperature increases, look for a sudden jump in fan speed. Initially I get a Trans Flush at Hello, everyone. DIY: Viscous Fan Clutch - Silicone Oil Refill - YouTube Coolant temperature sensor circuit problems can set a DTC. So you suspect that your fan clutch is defective. %%EOF 0000052661 00000 n Never seems to lock up completely (or even the 90%) I tried applying 12v to the clutch directly (white wire) but there was no speed change. It will regulate engine temperatures more efficiently compared to older direct fuel injection engine models. hb```"wVF/3 1K6l|Z+W9"qHg6Engl!z,A& qx3h9@ -Vb5$?%?@,#Xj~aXSFe40hXmW{|o\ s2WIp?k2pUiF 0 gA If you find youre experiencing any of these fan clutch symptoms make sure to get your fan clutch checked out properly by a professional technician to correctly diagnose the issue. Clutch slipping and eventual failure are normal with time. adobe:docid:photoshop:2ce534b1-d8a3-11d8-a54e-a63691f3af4c DT -Determine if the fault is mechanical or electrical(and then follow the appropriate troubleshooting steps) . Subject: Troubleshooting Vehicles Equipped with Viscous Fan Drives Qualify by assuming the vehicle to be in OEM condition. It may be a good idea to check the temperature of a few different vents. Last Updated: August 7, 2022 They also have a thermostatic spring. 0000001895 00000 n Im pretty sure that is why this method is posted. Identify Your Viscous Fan Clutch If you are unable to find a part number on your viscous fan clutch, our easy-to-use fan clutch identification system will walk you through the process of measuring it to determine the proper replacement. In most cases, fan blades are designed to flex up to. Set the It disengaged once at 206 degrees, another time at 217 degrees but sometimes it stays engaged. 0 0 A binding fan clutch will typically be accompanied with warm air flow from the A/C, since the fan isnt turning the way it should be. When it happens its especially hard to take when you need your vehicle or application to finish a job. Roaring. Never seems to lock up completely (or even the 90%) I tried applying 12v to the clutch directly (white wire) but there was no speed change. I've been trying to read as many of these waterpump/fan post as possible. Anyone seen a case where the EV Fan Clutch DISENGAGES completely? Possible Cause: Damaged engine fan usually caused by friction, wear or entry of foreign objects. Read more! Its even more annoying if you dont know what role the fan clutch plays as part of the engine cooling system in your engine! If an open or shorted condition has developed in the electronically controlled viscous fan clutch circuit, a Diagnostic Trouble Code (DTC) can be set. wikiHow is where trusted research and expert knowledge come together. Right when it stop it tried to "tick" forward as I was holding it. rS&cD5Ts6'E7FdU()8GHVe*9:IJWXYZftugvwhijxyz i !1AQa"q2#BR 3br$Csc%4S5&DTdEU' At a stop, though, because the fan clutch doesn't engage and air isn't forced through the radiator, the engine can't dissipate excess heat. The "drive disc" and the "front half" share these closely spaced rings. The valve is activated by a pulse width modulation (PWM) output signal from the powertrain control module (PCM). Consider the symptoms listed above and be aware of potential failure. Quick tutorial on how to refill your viscous fan clutch with proper fluid and reseal the chamber. This includes heavy- and medium-duty trucks, agricultural tractors, vocational and specialty vehicles. uuid:2ce534b2-d8a3-11d8-a54e-a63691f3af4c 4.Engine Fan Test Results You will need to monitor the entire fan test while it is running to determine if the fan has passed or failed. 0000049755 00000 n Even when the drive is off the fan will spin between 50-300 rpm. You can do this by making a note of unusual noise or temperatures while driving, inspecting the housing for oil leakage or physical damage, measuring the amount of resistance offered by the fan blades. PDF Electronically Controlled Viscous Cooling Fan Perhaps the Heat Soak cannot get carried away because things may have gotten a bit "sluggish" inside of the radiating units? I replaced it earlier this year while chasing an overheating condition (along with the Water Pump and Thermostat). The fan clutch experts at Kit Masters can help you identify your fan so that you can determine the correct replacement. To learn more about cookies, including steps for disabling, view our Privacy Policy. PDF IK0900075 - Horton Stratis Fan Hub Diagnostics Page 1 of 13 Keep holding it while the engine gets hotter, As it gets hotter, you should start feeling some tugging from the fan trying to get it going. ` 0000060995 00000 n I only found it while trying to force it to overheat. image/tiff These fans are needed at slow speeds, typically below 35 mph and at idle. These fans are more efficient than flex fans that are controlled by engine speed instead of temperature. Its important to maintain the fan clutch in your vehicle, as its responsible for testing the temperature of the air coming through the radiator and preventing the engine from overheating. No CEL. If you have difficulty rotating or it's just stuck, then it could be either foreign object or clutch fan. 0000036305 00000 n It would definitely do damage. 14 0 obj <> endobj You can also perform this test while the vehicle is parked and in neutral gear. When the fan clutch engages, it spins up greatly, increasing air flow through the radiator and over the engine. I just repaired a electro viscous clutch today on my 02 TrailBlazer. 1 hz on the cooling fan speed signal circuit equals about 1 rpm of actual fan speed. It may work at 100% but maybe not at 20-30%. Virtually any on- or off-highway engine can benefit from viscous cooling technology. Like all viscous fan clutches it may be turning, but is it working correctly? Viscous Fan Clutch | Kit Masters Customer Question. &\cUj Viscous drives tend to have the first two issues. In addition to regulating engine temperatures with razor-sharp precision, viscous-operated fan drives can produce lower emissions, decrease noise pollution, provide fuel savings and ultimately increase performance. Symptoms of a Bad or Failing Fan Clutch | YourMechanic Advice By . Now what? Very interesting info and could be useful to anyone that has a scope and/or high end scanner or Tech 2. If loosened, the P-clamp must be re-tightened to prevent the wiring harness from slipping through the P-clamp, causing tension on the Fan Clutch wiring. Viscous fan clutch is going to be the norm when more industrial engine uses ECM/ECU. Engine still runs great! 2625 This should lock the clutch and pull air like a dump truck. '06 Trailblazer LS, '14 Silverado LT Z71, and '17 Jeep Renegade Trailhawk, "Chance Favors The Prepared Mind" Dr. Louis Pasteur, You can't have my fish, but if you ask nicely, I'll help you catch your own. A properly-functioning fan clutch is critical to engine reliability, as it works to maintain a safe temperature range. Front-wheel drive vehicles are equipped with a completely different cooling system due to the way the engine is configured. A slipping fan clutch can result in failed cooling, increased engine strain, and poor fuel efficiency, which is why its important to evaluate the condition your vehicles fan clutch if you suspect it might be wearing out. AC little warm. Like any other part, fan clutches can develop issues that, if left unchecked, can be both devastating and costly. The sensor returns a signal pulse through the cooling fan speed signal circuit. The fan clutch is responsible for controlling the operation of the cooling fans. 0000070141 00000 n Horton Fan Clutch - Troubleshooting - Diesel Components, Inc The oil flows to and from the main chamber as engine heat fluctuates, engaging and disengaging the clutch. Adobe Photoshop CS Windows Your vehicles fan clutch is an often overlooked but important little partits responsible for gauging the temperature of the air passing through the radiator and keeping the engine from overheating. While youre at it, consider the performance and fuel economy benefits of upgrading to electric cooling fans. HWyTSW; * 1d!y ZmK*8gA:s9hG{F;3U9Q]DMNDIBM. References. % of people told us that this article helped them. B=uJqc-I]-Y;6?VGx#qL.Vb&3Lv.EA5NYH$9&V=%n" Then let it get hot. When a pneumatic fan clutch fails, it's likely one of three symptoms is present: The clutch won't engage. Has the waterpump bearing seized around the fan shaft? One (of many) of my top things to do is service the Transmission. Global Parts Distributors has the electronic fan clutch assembly: part number 2911297. For your own safety, you should never attempt to manually test your fan clutch while the vehicle is running. Electronic-Viscous Fan Clutch Troubleshooting. Could not find any bad wires, just looseness in the actual pins inside the connector. xref Some fan clutches are designed with a built-in thermometer somewhere on the instrument panel. All it does is freewheel and has no resistance. I'm open to ideas. Ed and the InTechgrity Automotive Excellence Team are approved by the American Automobile Association (AAA) for repairs and are Automotive Service Excellence (ASE) certified. Swap the fan relay with another similar one in the fuse box (headlight IIRC) and see if the problem persists. Warning: This post may contain misspelling, grammatical errors, disorganized sentence structure. You are using an out of date browser. We don't all go to a dealer to get work done right away. Secondly, if your viscous fan hub is electronically controlled, check if the wire is unplugged or damaged. Appreciate the help. It disengaged once at 206 degrees, another time at 217 degrees but sometimes it stays engaged. If it feels the same, then I would assume the clutch is done. This article was co-authored by Ed Beery. Fan clutch have a patented System Sentry, which goes about as an early cautioning fuse to alarm the administrator. Check the gauge for proper operation (especially electric gauges). If you end up in full lock, the thing is somehow getting a constant positive, the pcm should see that and set a light because its command and actual are different. 1 Luckily, there are a few symptoms you can look for to diagnose whether the fault is a seized fan clutch or not. How to Tell If Your Fan Clutch Is Going Bad - LiveAbout Benjamin Jerew is an ASE-certified Master Automobile Technician with over a decade of experience in auto repair, maintenance, and diagnosis. Check Mechanical Integrity of Clutch With engine off, rotate fan by hand. There is a very easy way to test the fan clutch for staying fully engaged all the time. By opening and closing the fluid port valve, the PCM controls the fan speed. You must log in or register to reply here. Viscofans is in no way affiliated to any of the brands shown on this site. We are working every day to make sure our community is one of the best. tt4*ittd830z02OL0 p I feel like I reset something because I've never seen it go slow then engage. Thanks to all authors for creating a page that has been read 118,630 times. Common Fan Clutch Noises And What They Mean | GMB Blog On the other hand, too much heat can be a big problem, melting non-metal engine parts and rendering lubricating oil useless. Fan Clutch. Viscous fan clutches are belt-driven and found on many older rear-wheel-drive passenger cars. These fans are needed at slow speeds, typically below 35 mph and at idle. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/4\/42\/Test-a-Fan-Clutch-Step-1.jpg\/v4-460px-Test-a-Fan-Clutch-Step-1.jpg","bigUrl":"\/images\/thumb\/4\/42\/Test-a-Fan-Clutch-Step-1.jpg\/aid9382520-v4-728px-Test-a-Fan-Clutch-Step-1.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"